Need help please

Projects Programming
1

I'm using a camera to take pics using Arduino Mega and SD card, but I want to add a code for a button to on/off the camera as pressed.
this is the cam program I did
.........................................
#include <camera_VC0706.h>
#include <SD.h>
#include <SoftwareSerial.h>

#define chipSelect 53
#if ARDUINO >= 100
SoftwareSerial cameraconnection = SoftwareSerial(2, 3);
#else
NewSoftSerial cameraconnection = NewSoftSerial(2, 3);
#endif
camera_VC0706 cam = camera_VC0706(&Serial1);
void setup() {

#if !defined(SOFTWARE_SPI)
#if defined(AVR_ATmega1280) || defined(AVR_ATmega2560)
if(chipSelect != 53) pinMode(53, OUTPUT); // SS on Mega
#else
if(chipSelect != 4) pinMode(4, OUTPUT); // SS on Uno, etc.
#endif
#endif

pinMode(7,INPUT_PULLUP);
Serial.begin(9600);
Serial.println("VC0706 Camera test");

//SD卡检测
if (!SD.begin(chipSelect)) {
Serial.println("Card failed, or not present");
return;
}

// 查询摄像头
if (cam.begin()) {
Serial.println("Camera Found:");
} else {
Serial.println("No camera found?");
return;
}
// 摄像头版本号
char *reply = cam.getVersion();
if (reply == 0) {
Serial.print("Failed to get version");
} else {
Serial.println("-----------------");
Serial.print(reply);
Serial.println("-----------------");
}

// 选择合适的图片尺寸 640x480, 320x240 or 160x120
// 图片越大，传输速度越慢
cam.setImageSize(VC0706_640x480);
//cam.setImageSize(VC0706_320x240);
//cam.setImageSize(VC0706_160x120);

uint8_t imgsize = cam.getImageSize();
Serial.print("Image size: ");
if (imgsize == VC0706_640x480) Serial.println("640x480");
if (imgsize == VC0706_320x240) Serial.println("320x240");
if (imgsize == VC0706_160x120) Serial.println("160x120");

Serial.println("Get ready !");

}

void loop() {

if(digitalRead(7)== 0) { //按键检测
delay(10);
if(digitalRead(7)== 0) {
if (! cam.takePicture())
Serial.println("Failed to snap!");
else
Serial.println("Picture taken!");
char filename[13];
strcpy(filename, "IMAGE00.JPG");
for (int i = 0; i < 100; i++) {
filename[5] = '0' + i/10;
filename[6] = '0' + i%10;
// create if does not exist, do not open existing, write, sync after write
if (! SD.exists(filename)) {
break;
}
}
File imgFile = SD.open(filename, FILE_WRITE);
uint16_t jpglen = cam.frameLength();
Serial.print(jpglen, DEC);
Serial.println(" byte image");

Serial.print("Writing image to ");
Serial.print(filename);

while (jpglen > 0) {
// 一次读取32bytes
uint8_t *buffer;
uint8_t bytesToRead = min(32, jpglen); // 调节一次性读取数据大小，从32-64byte ，过大容易不工作
buffer = cam.readPicture(bytesToRead);
imgFile.write(buffer, bytesToRead);
jpglen -= bytesToRead;
}
imgFile.close();
Serial.println("...Done!");
cam.resumeVideo();
}
}
}

2

but I want to add a code for a button to on/off the camera as pressed.

Is the camera capable of being turned off?

3

Supposing you mean taking the picture from the button press, not on/off the camera really?

You need to add {} around your else code

if (! cam.takePicture())
            Serial.println("Failed to snap!");
         else [color=red]{[/color]
            Serial.println("Picture taken!");
         char filename[13];
         strcpy(filename, "IMAGE00.JPG");
....// all the code that saves the image to the SD card
          [color=red]}[/color]

Because you only want to save the file if the picture has been taken.

The way your code is written, if you keep the button pressed it will take another picture after saving the previous one. If you don't want that behavior, then you need a state to capture when the button is released after taking a picture.

4

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Good Luck!